Felons voting

Minnesota has long faced the dilemma of how to deal with convicted sex offenders. The current system says that when a sex offender has complete his sentence he must then go to another prison based on the concept of something he might do. Experts have currently determined that these offenders will once again offend if given the opportunity. Common sense dictates that you should not be sent to prison for something you might do based on some experts opinion but that is where the law stands. Florida approved voting rights for convicted felons who have served their time except for those convicted of murder or rape. Is this based on some data that says they will murder or rape again and if so should they be released. Will some convicted murderer go to court over the equal protection of the 14th amendment?